CN112422522A - Medical data safety sharing method based on block chain - Google Patents
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Abstract
The invention discloses a medical data security sharing method based on a block chain, which adopts a technology based on the block chain to construct a medical data sharing system, and can well solve the problem of medical data storage of more than 100 tens of thousands of medical institutions in the country due to the distributed characteristic of the block chain, thereby realizing interconnection and intercommunication of medical data on a alliance chain; in addition, the complete medical data is stored offline, and information including a hash value, a patient signature, a hospital signature, disease keywords and a timestamp of the complete medical data is used as uploaded data, so that the medical data is a first barrier for preventing the medical data of the patient from being leaked; the EIGamal encryption algorithm and the symmetric encryption algorithm are adopted to realize medical data sharing, the EIGamal encryption algorithm and the symmetric encryption algorithm are used for preventing medical data of patients from being leaked, and due to the fact that the symmetric encryption algorithm is adopted to transmit data, compared with the method of simply using the EIGamal encryption algorithm, the EIGamal encryption algorithm can obviously improve efficiency.
Description
Technical Field
The invention relates to the technical field of data security sharing, in particular to a medical data security sharing method based on a block chain.
Background
According to the' 2019 national health care cause development and statistics bulletin ", published in 6 months in 2020, the total number of national medical and health institutions exceeds 100 ten thousand, each medical institution generates massive medical data every day, and the utilization rate of the medical data is very low. The main reason is that although most medical institutions in China establish centralized medical information management systems, interconnection and intercommunication among the institutions are not realized. If the same patient is treated in different medical institutions, the medical data of the patient cannot be circulated in time, so that the doctor can repeatedly check the disease of the patient, diagnose the disease in time or diagnose the disease in error, and the like, thereby increasing the treatment cost of the patient and seriously wasting medical resources. In addition, since the medical data of the patient is mastered by the medical institution, the situation that the patient does not have control right on the medical data of the patient is formed, and the centralized information management system of the medical institution is easy to be attacked by hackers, internally leaked and tampered, so that the safety of the medical privacy information of the patient cannot be guaranteed; moreover, in terms of medical research, the conventional medical data storage method causes a great deal of waste of medical research data. In order to solve the problems, the block chain technology has natural advantages for safely sharing medical data of more than 100 tens of thousands of medical institutions in the country.
In the technical scheme of the prior art:
(1) a medical data sharing system and method based on a block chain (with the publication number being CN110289056A) are provided, wherein uploading and downloading of medical data are realized by constructing a alliance chain, namely, after a patient completes real-name registration in the medical data sharing system, the medical data is encrypted through a private key of the patient, and for an authorized medical institution, the medical data of the patient can be uploaded to the block chain for storage, and the encrypted medical data on the chain can be decrypted through a public key of the patient.
(2) In journal EHR data secure storage sharing scheme based on block chain, authors propose an Electronic Health Records (EHR) data secure storage sharing scheme based on block chain. The certificateless content extraction signature algorithm is adopted to provide privacy protection of data, the secure sharing of the data is achieved by combining an intelligent contract, then an interplanetary file system (IPFS) is used for storing real private data, and only a hash value of encrypted data is stored in a alliance chain.
However, the above solutions all have their own disadvantages, which are summarized as follows:
1. some existing systems for sharing medical data upload medical data directly to a blockchain, which may result in large blocks on the blockchain, and may exceed the block size limit.
2. The medical data complete copies in part of the existing medical data sharing systems are stored in the cloud, so that the whole alliance chain sharing system is highly dependent on cloud services, and once the cloud services are down or attacked, the privacy disclosure result is unimaginable.
3. In some existing medical data sharing systems, an authorized institution can directly decrypt and obtain patient medical data by using a patient public key, if the patient public key is disclosed to an unauthorized institution, the unauthorized institution can obtain the patient medical data, and privacy confidentiality of the system data is not high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a medical data security sharing method based on a block chain.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a medical data safety sharing method based on a block chain comprises the following steps:
s1, constructing a medical data safety sharing system based on the block chain, and carrying out system setting;
s2, the patient goes to a clinic hospital for treatment, and the clinic hospital encrypts and uploads part of information of the medical data generated by the patient to a alliance chain;
s3, the medical institutions joining the alliance chain request sharing medical data by sending information to patients, and the medical data sharing process adopts mixed encryption of an EIGamal encryption algorithm and a symmetric encryption algorithm;
and S4, downloading the complete medical data from the application program interface of the hospital after the medical institution obtains the authority.
Further, in step S1, the system setting includes:
s1-1, setting a large prime number q, the generator of which is G, and generating a q-order cyclic group G by using the generator Gq；
S1-2, presetting a safety parameter K, and generating public system parameters, namely: randomly select k ← {0,1 })K(ii) a Setting an anti-hash collision function H: {0,1}*→GqA valid reversible hash function H1: {0,1}K→Gq。
Further, the specific process of step S2 is as follows:
s2-1, the patient goes to a hospital for treatment to generate medical data;
s2-2, the hospital for treatment copies the medical data generated in the step S2-1 to a copy to the patient completely;
s2-3, after the consent of the patient, the hospital for treatment encrypts and issues the information including the Hash value of the medical data of the patient, the signature of the hospital for treatment and the disease keywords through an AES algorithm for transaction;
s2-4, packaging the transactions in the transaction pool into blocks;
s2-5, formally winding the packaged blocks.
Further, the specific process of step S3 is as follows:
and (3) identity confirmation process:
the method comprises the following steps: the patient randomly selects a value x as the own private key on the { 1.,. q-1} interval under the q value set by the system, and then calculates h ═ g ·xFinally (h, G)qQ, g) value is sent as a public key to the federation chain;
step two: the medical institution sends a request m for sharing medical records to the patient;
firstly, a medical institution randomly selects a value y as a temporary secret key in a { 1.,. q-1} interval; then calculate C1＝gyAnd calculating the shared secret s ═ hy(ii) a Mapping the shared medical record request information m to GqOne element m 'above, i.e. m' ═ h (m); calculating C2M's; and finally, requesting information: (C)1,C2)＝(gy,m'·hy)＝(gy,m'·(gx)y) Sending to the patient;
step three: patient calculation shared secret s ═ C1 xAnd then m' ═ C was verified2·s-1＝m'·hy·(gxy)-1＝m'·gxy·g-xyIf m' is true, the identity of the organization is verified, and if the identity of the organization is not verified, the request is finished;
and a data sending process:
the method comprises the following steps: and after the medical institution requests that the verification is passed, encrypting the information plaintext of the target block on the chain by adopting a symmetric encryption algorithm: first randomly select k1∈{0,1}K，r1∈ZqAnd calculating k'1＝H1(k,k1)，z1＝gr1，z2＝hr1·k'1Generating a ciphertext C ═ Enc (k)1M) sending to a medical institution;
step two: when medical institutionWhen receiving the ciphertext C, calculating ks＝z2z1 -r0，
Then, k 'is utilized'sThat is, the plaintext M ═ Dec (k) can be obtained by decryptions',C)。
Compared with the prior art, the principle and the advantages of the scheme are as follows:
1. the medical data control right of the patient is transferred from the hospital or medical institution to the hand of the patient, and the patient holds the control right of the medical data. The medical institutions in the alliance chain want to acquire the medical data of the patients, and the requests are sent to the patients, so that the risks of medical data leakage are reduced by the patients' personal customs.
2. By adopting a mixed encryption mode, namely combining an EIGamal encryption algorithm with a symmetric encryption algorithm, the data transmission efficiency can be improved under the condition of ensuring the security of medical data of patients.
3. The medical data uploaded to the chain is not a complete medical data copy, but a hash value, a patient signature, a hospital signature, disease keywords and timestamp information of the complete medical data, and the medical institution needs to obtain the right to download the complete medical data from the application program interface of the hospital for treatment on the chain, so that the medical institution with the right can obtain the complete medical data, and the size of the block can be greatly reduced.
4. The complete medical data is not stored on the cloud, but is directly stored in the hospital database and is completely backed up for the patient, so that the system and the cloud service are not dependent, and the cohesion of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required for the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a process of uploading medical data of a patient in a medical data security sharing method based on a blockchain (marked in the figure: 1-patient, 2-hospital, 3, 4-medical data, 5-transaction pool);
FIG. 2 is a schematic diagram of a sharing process of medical data of a patient in a medical data security sharing method based on a blockchain (marked in the figure: 1-patient, 2-visit hospital, 3-medical institution).
Detailed Description
The invention will be further illustrated with reference to specific examples:
the embodiment of the invention provides a medical data safety sharing method based on a block chain, which comprises the following specific steps:
s1, constructing a medical data safety sharing system based on the block chain, and carrying out system setting; wherein the system setup comprises:
s1-1, setting a large prime number q, the generator of which is G, and generating a q-order cyclic group G by using the generator Gq；
S1-2, presetting a safety parameter K, and generating public system parameters, namely: randomly select k ← {0,1 })K(ii) a Setting an anti-hash collision function H: {0,1}*→GqA valid reversible hash function H1: {0,1}K→Gq。
S2, the patient goes to a clinic hospital for treatment, and the clinic hospital encrypts and uploads part of information of the medical data generated by the patient to a alliance chain;
as shown in fig. 1, the specific process of this step is as follows:
s2-1, the patient goes to a hospital for treatment to generate medical data;
s2-2, the hospital for treatment copies the medical data generated in the step S2-1 to a copy to the patient completely;
s2-3, after the consent of the patient, the hospital for treatment encrypts and issues the information including the Hash value of the medical data of the patient, the signature of the hospital for treatment and the disease keywords through an AES algorithm for transaction; since patients and the hospital of treatment each have a complete copy, they can verify the correctness of the data on the chain by the copy at any time; in addition, the signature mechanism makes it impossible for both the patient and the hospital to be confident.
S2-4, packaging the transactions in the transaction pool into blocks;
s2-5, formally winding the packaged blocks.
S3, the medical institutions joining the alliance chain request sharing medical data by sending information to patients, and the medical data sharing process adopts mixed encryption of an EIGamal encryption algorithm and a symmetric encryption algorithm;
as shown in fig. 2, the specific process of this step is as follows:
and (3) identity confirmation process:
the method comprises the following steps: the patient randomly selects a value x as the own private key on the { 1.,. q-1} interval under the q value set by the system, and then calculates h ═ g ·xFinally (h, G)qQ, g) value is sent as a public key to the federation chain;
step two: the medical institution sends a request m for sharing medical records to the patient;
firstly, a medical institution randomly selects a value y as a temporary secret key in a { 1.,. q-1} interval; then calculate C1＝gyAnd calculating the shared secret s ═ hy(ii) a Mapping the shared medical record request information m to GqOne element m 'above, i.e. m' ═ h (m); calculating C2M's; and finally, requesting information: (C)1,C2)＝(gy,m'·hy)＝(gy,m'·(gx)y) Sending to the patient;
step three: patient calculation shared secret s ═ C1 xAnd then m' ═ C was verified2·s-1＝m'·hy·(gxy)-1＝m'·gxy·g-xyIf m' is true, the identity of the organization is verified, and if the identity of the organization is not verified, the request is finished;
and a data sending process:
the method comprises the following steps: after the medical institution requests the verification to pass, the symmetric encryption algorithm is adopted to carry out the verification on the target block on the chainAnd (3) encrypting information plaintext: first randomly select k1∈{0,1}K，r1∈ZqAnd calculating k'1＝H1(k,k1)，z1＝gr1，z2＝hr1·k'1Generating a ciphertext C ═ Enc (k)1M) sending to a medical institution;
step two: when the medical institution receives the ciphertext C, k is calculateds＝z2z1 -r0，
Then, k 'is utilized'sThat is, the plaintext M ═ Dec (k) can be obtained by decryptions',C)。
And S4, downloading the complete medical data from the application program interface of the hospital after the medical institution obtains the authority.
In this embodiment, the visiting hospital refers to a hospital or clinic that generates electronic medical data of a patient, and the medical institution refers to all medical institutions such as hospitals or clinics that want to acquire the electronic medical data of the patient.
In the embodiment, a medical data sharing system is constructed by adopting a block chain-based technology, and due to the distributed characteristic of the block chain, the problem of medical data storage of more than 100 ten thousand medical institutions in the country can be well solved, so that interconnection and intercommunication of medical data on a alliance chain are realized; in addition, the complete medical data is stored offline, and information including a hash value, a patient signature, a hospital signature, disease keywords and a timestamp of the complete medical data is used as uploaded data, so that the medical data is a first barrier for preventing the medical data of the patient from being leaked; the EIGamal encryption algorithm and the symmetric encryption algorithm are adopted to realize medical data sharing, the EIGamal encryption algorithm and the symmetric encryption algorithm are used for preventing medical data of patients from being leaked, and due to the fact that the symmetric encryption algorithm is adopted to transmit data, compared with the method of simply using the EIGamal encryption algorithm, the EIGamal encryption algorithm can obviously improve efficiency.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (5)
1. A medical data security sharing method based on a blockchain is characterized in that a medical data security sharing system based on the blockchain is constructed in a mode of a union chain in the blockchain; the hospital for treatment encrypts and uploads part of information of medical data generated by a patient to a alliance chain, a medical institution joining the alliance chain requests to share the medical data by sending the information to the patient, the medical data sharing process adopts mixed encryption of an EIGamal encryption algorithm and a symmetric encryption algorithm, and the medical institution downloads complete medical data from a hospital for treatment application program interface after obtaining the authority.
2. The safe sharing method of medical data based on block chains as claimed in claim 1, characterized by comprising the following steps:
s1, constructing a medical data safety sharing system based on the block chain, and carrying out system setting;
s2, the patient goes to a clinic hospital for treatment, and the clinic hospital encrypts and uploads part of information of the medical data generated by the patient to a alliance chain;
s3, the medical institutions joining the alliance chain request sharing medical data by sending information to patients, and the medical data sharing process adopts mixed encryption of an EIGamal encryption algorithm and a symmetric encryption algorithm;
and S4, downloading the complete medical data from the application program interface of the hospital after the medical institution obtains the authority.
3. The method for safely sharing medical data based on block chain according to claim 2, wherein in the step S1, the system setting comprises:
s1-1, setting a large prime number q, the generator of which is G, and generating a q-order cyclic group G by using the generator Gq；
S1-2, presetting a safety parameter K, and generating public system parameters, namely: randomly select k ← {0,1 })K(ii) a Setting an anti-hash collision function H: {0,1}*→GqOne is provided withEfficient reversible hash function H1: {0,1}K→Gq。
4. The method for safely sharing medical data based on blockchain according to claim 3, wherein the specific process of the step S2 is as follows:
s2-1, the patient goes to a hospital for treatment to generate medical data;
s2-2, the hospital for treatment copies the medical data generated in the step S2-1 to a copy to the patient completely;
s2-3, after the consent of the patient, the hospital for treatment encrypts and issues the information including the Hash value of the medical data of the patient, the signature of the hospital for treatment and the disease keywords through an AES algorithm for transaction;
s2-4, packaging the transactions in the transaction pool into blocks;
s2-5, formally winding the packaged blocks.
5. The method for safely sharing medical data based on blockchain according to claim 3, wherein the specific process of the step S3 is as follows:
and (3) identity confirmation process:
the method comprises the following steps: the patient randomly selects a value x as the own private key on the { 1.,. q-1} interval under the q value set by the system, and then calculates h ═ g ·xFinally (h, G)qQ, g) value is sent as a public key to the federation chain;
step two: the medical institution sends a request m for sharing medical records to the patient;
firstly, a medical institution randomly selects a value y as a temporary secret key in a { 1.,. q-1} interval; then calculate C1＝gyAnd calculating the shared secret s ═ hy(ii) a Mapping the shared medical record request information m to GqOne element m 'above, i.e. m' ═ h (m); calculating C2M's; and finally, requesting information:
(C1,C2)＝(gy,m'·hy)＝(gy,m'·(gx)y) Sending to the patient;
step three: patient calculation shared secret s ═ C1 xAnd then m' ═ C was verified2·s-1＝m'·hy·(gxy)-1＝m'·gxy·g-xyIf m' is true, the identity of the organization is verified, and if the identity of the organization is not verified, the request is finished;
and a data sending process:
the method comprises the following steps: and after the medical institution requests that the verification is passed, encrypting the information plaintext of the target block on the chain by adopting a symmetric encryption algorithm: first randomly select k1∈{0,1}K，r1∈ZqAnd calculating k'1＝H1(k,k1)，z1＝gr1，z2＝hr1·k'1Generating a ciphertext C ═ Enc (k)1M) sending to a medical institution;
step two: when the medical institution receives the ciphertext C, k is calculateds＝z2z1 -r0，k's＝H1 -1(k,ks) Then, k 'is utilized'sThat is, the plaintext M ═ Dec (k's,C)。
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| CN112951356B (en) * | 2021-03-23 | 2023-03-31 | 电子科技大学 | Cross-modal medical data joint sharing method based on alliance chain |
| CN113297618A (en) * | 2021-05-28 | 2021-08-24 | 广东工业大学 | Anti-attack access control method, system, device and medium based on block chain |
| CN113656829A (en) * | 2021-07-22 | 2021-11-16 | 北京理工大学 | Medical data security sharing method based on lattice code and alliance chain |
| CN113870964A (en) * | 2021-09-14 | 2021-12-31 | 西南交通大学 | Medical data sharing encryption method based on block chain |
| CN113870964B (en) * | 2021-09-14 | 2023-04-07 | 西南交通大学 | Medical data sharing encryption method based on block chain |
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| CN112422522B (en) | 2023-01-20 |
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